Combined noxious gas detector and monitoring unit



FIG. 1 is a left front perspective view of a combined noxious gasdetector and monitoring unit showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof;

FIG. 7 is a right side elevational view thereof.

The ornamental design for a combined noxious gas detector and monitoringunit, as shown and described.